A solution contains 2.2 × 10⁻³ M in Cu²⁺ and 0.33 M in LiCN. If the Kf for Cu(CN)₄²⁻ is 1.0 × 10^25, how much copper ion remains at equilibrium?

A) 1.9 x 10⁻²⁶ M
B) 6.7 × 10⁻²⁸ M
C) 3.8 × 10⁻²⁴ M
D) 4.6 × 10⁻²⁵ M
E) 2.9 × 10⁻²⁷ M